Instead, it's a small-scale update to macOS Sierra going from macOS 10.12 to 10.13. Apple said the computer is the most powerful Mac it has ever built, with the latest and most powerful processors on the market. Apple's four software platforms - iOS, macOS, watchOS and tvOS - provide seamless experiences across all Apple devices and empower people with breakthrough services including the App Store, Apple Music, Apple Pay and iCloud. Together, these deliver up to 11 Teraflops of single-precision graphics computation (22 Teraflops at "half precision"), and the most advanced graphics ever put inside a Mac. The company also teased a new Mac Pro, which will be available by the end of this year.

The new processors are from Intel'sKaby Lake family, and some of them have been available for the better part of a year.

The iMac Pro's starting configuration will be $4,999. Apple said is the "most modern desktop for pro customers".

The 27in iMac models get Fusion drives as standard and up to 64GB of RAM. Talking of storage, the iMac Pro comes out with support for up to 128GB ECC memory and up to 4TB of 3GB/s SSD storage. It carries up to twice the memory as the past generation. The new MacBook Air models will also get a bump in processor speed. The new iMacs come with Intel Kaby Lake processors and also include memory boost.

Apple today updated its iMac line with three times more powerful graphics, faster processors, Thunderbolt 3, faster storage options and brighter Retina displays and added a Retina 4K display and discrete graphics to the $1,299 (US) 21.5-inch iMac.

Due on sale this December, the iMac Pro has the same exterior design as the standard 27-inch Mac but with an alluring Space Grey finish plus matching keyboard and mouse. It also features support for 1 billion colours.

We'll see how the iMac Pro performs (and how much it'll cost in New Zealand) by December, which is a long time to wait.

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